A guide to Illinois Watch Co. size 12 watches, Grade 539.
Grade 539 runs.
Serial numbers used on this page by the kind permission of
Russell W Snyder
Grade 539,
21 ruby and sapphire jewels adjusted to 5 positions, manufactured from 1918 to 1921 a total of 300 movements in 3 runs make up this grade. Model 1XT
size 13 open faced; bridge movements of extra high quality with patent DeLong 5 tooth click, Illinois superior motor barrel, double roller and simple
regulator.

Observations,
The movements have broad striped pattern and named Illinois Watch Co. Illini Extra. They have burnished set jewels on the bridges and silver snap on
bezel dials. This was the second of the Extra thin size 13 models to be made and  were factory cased in 14K gold cases, Solidarity cases were used its
not clear if any other cases were used.

Description,
21 extra quality ruby and sapphire jewels; special tempered compensating center arm balance, having gold screws and timing screws; adjusted to
temperature, 5 positions and isochronism; Breguet hairspring; double roller escapement; hardened and polished steel escape wheel; patent Illinois
superior motor barrel, both pivots of the barrel staff operating in sapphire jewels; patent recoil bar and pinion click; concave and polished winding wheels;
perfect pendant setting mechanism of exceptional simplicity entirely in movement; snap on bezel dial.

Images,
Grade 539 images are stored on Flickr, press the back arrow to return to this page.
Run.
Date
From
To
Total
H/O
Jls
Adj.
Named
1
1918
3,517,901
3,518,000
100
O
21
5 Pos.
Illinois Watch Co. Illini Extra.
2
1918
3,650,101
3,650,200
100
O
21
5 Pos.
Illinois Watch Co. Illini Extra
3
1921
3,869,001
3,869,100
100
O
21
5 Pos.
Illinois Watch Co. Illini Extra.
 
Total
300
 
 
Last update 02/19/2015.